ANATOMY OF MAKELLIA REMIPES — CARBON ELL 



77 



The hind wing of Marellia (fig. lo B) is well developed in its van- 

 nal region. Its remigial region, on the contrary, is narrow and shows 

 a simplified R + M system. 



The articulation of the wings. — The articulation of the wings in 

 Marellia (fig. 7) does not differ much from the articulation of the 

 wing in Dissosteira (Snodgrass, 1929). In both wings the four axil- 

 lary sclerites (Ax) are distinct and so are the median plates (m, m'). 

 The epipleurites beneath the wing base (fig. 8, Ba, Sa) are almost 

 identical with those of Dissosteira. A curious feature of the articula- 

 tion of the wing in Marellia is the development of bulblike tubercles 

 covered with spiny hairs on the distal parts of the third axillary 



---SA 



3Ax 



Fig. II. — Base of right tegmen of Marellia ranipes (ventral or inferior view), 

 showing tlie tegminal part of the locking apparatus of the fore wing. 



lA, 2 A, sA, first, second, and third anal veins ; 3 Ax, third axillary sclerite ; 

 C, costa; Cn i, 2, first and second cubitus; M, media; m, m', median plates of 

 the wing base ; R, radius ; Sc, subcosta ; So, socket of the locking apparatus of 

 the fore wing. 



sclerites (fig. 7, jAx) of both wings. As has been said elsewhere, 

 these tubercles are similar to those of the lateral prescutal areas of 

 the mesothorax (Spt), and a study of their microscopic anatomy 

 would be necessary to ascertain their function. 



The locking apparatus of the fore wing. — There are on the under- 

 surfaces of the tegmina some structures that, in connection with the 

 second axillary sclerites of the hind wings, form a device that firmly 

 locks the fore wings in their resting or flexed position. 



Observing the inferior surface of the basal portion of the tegmen 

 (fig. 11) there can be noticed, at the basal portion of the first anal 

 vein, a fairly deep socket (^0) surrounded by raised edges. The edge 

 on the anal side of the wing is higher and sharper and projects over 

 the bottom of the cavity. When the wings are flexed in the normal 

 resting position, the very prominent second axillary sclerite of the 



